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Chapter 3
Configuring Ethernet Switching
Configuring a Port to Connect to a Cisco 7960 IP Phone
Disabling Inline Power on a Catalyst 4224
OL-2031-02
Because the sound quality of an IP telephone call can deteriorate if the data is
unevenly transmitted, the current release of the Cisco IOS software supports
Quality of Service (QoS) based on IEEE 802.1p Class of Service (CoS). QoS uses
classification and scheduling to transmit network traffic from the switch in a
predictable manner.
The Cisco 7960 IP Phone contains an integrated three-port 10/100 switch. These
dedicated ports connect to the following devices:
Port 1 connects to the Catalyst 4224 switch or other Voice-over-IP device.
•
Port 2 is an internal 10/100 interface that carries the phone traffic.
•
Port 3 connects to a PC or other device.
•
Figure 3-2 on page 3-3
Because a Cisco 7960 IP Phone also supports connection to a PC or other device,
a port connecting a Catalyst 4224 to a Cisco 7960 IP Phone can carry a mix of
traffic. There are three ways to configure a port connected to a Cisco 7960 IP
Phone:
All traffic is transmitted according to the default CoS priority (0) of the port.
•
This is the default.
Voice traffic is given a higher priority by the phone, and all traffic is in the
•
same VLAN.
Voice and data traffic are carried on separate VLANs, and voice traffic
•
always has a CoS priority of five.
The Catalyst 4224 can supply inline power to the Cisco 7960 IP Phone if
necessary. The Cisco 7960 IP Phone can also be connected to an AC power source
and supply its own power to the voice circuit. When the Cisco 7960 IP Phone is
supplying its own power, a Catalyst 4224 can forward IP voice traffic to and from
the phone.
Catalyst 4224 Access Gateway Switch Software Configuration Guide
Managing the Catalyst 4224 Access Gateway Switch
shows a sample configuration for a Cisco 7960 IP Phone.
3-15
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Troubleshooting
